How to create an empty dataframe

Question

I saw this line of code from a book, what does that mean? After that, I print portfolio, it is just a underscore, but it is not empty DataFrame.

portfolio = portfolio = pd.DataFrame()

Answer 1

You're seeing the result of how an empty DataFrame is displayed,. The DataFrame is in fact empty; you can see this better using a print or checking the empty attribute.

import pandas as pd
df = pd.DataFrame()

display(df)
#_

print(df)
#Empty DataFrame
#Columns: []
#Index: []

df.empty
#True

Answer 2

portfolio = pd.DataFrame() does create an empty DataFrame where you can then add columns like e.g. portfolio['my_col'] = np.zeros(10) . I'm note sure I understand your question, could you give some more information?